About the item 8 inch weed brush steel wire wheel brush disc 25.4mm x 200mm trimmer head, This blade fits most gas and electric straight shaft trimmers with a 1-inch arbor. Just need to connect weed brush to the shaft punch of the mower, it can be quickly and easily assembled and disassembled. Replacement for String Trimmers, Gardening Lawnmower, Moss Grass Rust Removal. The 2 different inside diameter of collar nuts are about 0.315inch and 0.3inch. Thrust Washer(10 teeth) and Thrust plate guard washer (6 teeth). Check your models before buy, make sure the brush fit your model. The weed brush with twist knot wire and internal holding plate to ensure stability and safety. Aside from trimming the lawn, this twisted rotary wheel is perfect for trimming tight and paved corners, clearing moss and growths on walkways, remove stubborn weeds on sand or gravel, removing rust and cement slag, deburring, and polishing applications. The rotary wired trimmer blades is made of high quality carbon steel wire, the steel wire rotary brush is not easy to destroy even after it hits rocks, stumps. The steel wire brush Blads are very flexible, hard, durable and not easily damaged. If there is any problem with this Blade Adapter Kit, please contact customer service in time, and you will get a satisfactory result.